Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · Cambridge IELTS 21 · 2026-08-17

IELTS Writing Task 1 question

The diagram below shows how one type of desert, known as a rain-shadow desert, is formed.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The formation of rain-shadow deserts

Student answer (Band 8.5)

The diagram illustrates the sequential, natural process by which a specific geographical phenomenon known as a rain-shadow desert is formed.

Overall, the process consists of seven distinct stages spanning thousands of kilometres, driven by the interaction between oceanic winds and a mountain range. The most notable feature is the sharp contrast between the windward side of the mountain, which receives abundant precipitation, and the dry leeward side, where the desert eventually develops.

Initially, the process begins when winds carrying moisture from the sea approach the coast. Upon encountering the mountain terrain, these winds are forced upwards along the windward slope. As this moist air mass rises higher into the atmosphere, it gradually cools down, causing the accumulated water vapor to condense and form clouds. Once these clouds become fully saturated, precipitation is triggered, resulting in heavy rainfall over the upper portion and peak of the mountain range.

Having dropped its moisture on the windward side, the remaining air mass crosses the summit and descends onto the leeward slope. Because the air is now significantly depleted of water vapor, no further cloud formation takes place on this side of the mountain range. These warm, dry winds continue to travel over inland areas for thousands of kilometres. Due to the prolonged absence of rainfall over this vast distance, highly arid conditions are created, culminating in the final formation of a rain-shadow desert.

AI examiner evaluation

Task Achievement / Task Response — Band 8.5

The response is excellent. You have fully addressed all parts of the task by providing a clear, logical summary of the rain-shadow desert formation process. You successfully identified the key stages, from the initial moisture-laden winds to the final arid conditions on the leeward side. The overview is particularly strong, as it synthesizes the main features—the contrast between the windward and leeward slopes—effectively. The information is well-selected and accurately reported, demonstrating a clear understanding of the diagrammatic information provided. There are no omissions, and the development of the process is logical and easy to follow.

Coherence and Cohesion — Band 8.5

The response is logically organized with a clear progression of ideas. Each paragraph serves a distinct purpose: the introduction sets the scene, the overview highlights the main contrast, and the body paragraphs detail the sequential stages of the process. Cohesive devices such as 'Initially', 'Upon encountering', 'As this moist air mass rises', and 'Having dropped its moisture' are used naturally and effectively to guide the reader through the process. Paragraphing is used skillfully, and the flow between sentences is seamless, making the text very easy to read.

Lexical Resource — Band 8.5

You demonstrate a wide and sophisticated range of vocabulary, which is used with precision and natural control. Terms such as 'sequential', 'geographical phenomenon', 'abundant precipitation', 'saturated', and 'depleted' are used accurately and in the correct context. The collocation is natural throughout, and there are no errors in word choice or spelling. The vocabulary is well-suited to the academic nature of the task, showing a high level of lexical flexibility that allows for a precise description of the scientific process.

Grammatical Range and Accuracy — Band 8.5

The writing displays a wide range of grammatical structures, including complex sentences with subordinate clauses and participial phrases (e.g., 'Having dropped its moisture on the windward side...'). The majority of sentences are error-free, and the control over punctuation and tense usage is excellent. The grammar is used with full flexibility, and there are no slips that impede communication. The sentence structures are varied, which contributes to the overall fluency and professional tone of the report.

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